Cam.



PATENTED FEB.11, 1908. Jio. H.'VAUGHT.

G'AM.

- APPLICATION FILED NOV.21, 1903. RENEWED FEB. 21, 1907.

JAMES CHARLES HOSKINS VAUGH'I, OF LEAD, SOUTH DAKOTA.

CAM.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed November 21' 1903. Serial No. 182.177- RenewedFebruary 21. 1907- Serial No. 358.724.

To all whom it may concern:

Be it known that 1, JAMES OriAnLEs Hos- KINS VAUGHT, citizen of theUnited States, residing at Lead, in the county of Lawrence and State ofSouth Dakota, have invented a new and useful Cam for Stampc /lills, ofwhich the following is a specification.

The invention relates to improvements in cams for stamp mills.

The object of the presentinvention is to im prove the construction ofcams for stamp mills and to provide a simple and comparativelyinexpensive one of great strength and durability, adapted to be readilyapplied to and removed from a cam shaft.

A further object of the invention is to provide means for enabling a camto engage a cam shaftautomatically with a grip varying with the weightor pressure to which the cam is subjected, whereby the same will beeffectually prevented from slipping on the cam shaft while a stamp millis in operation.

Another object of the invention is to enable a cam to be readilyloosened by a com paratively light tap of a hammer forcing it in abackward direction.

With these and other objects in view, the

invention consists in the construction and shoes.

novel combination and arrangement of parts, hereinafter fully described,illustrated in the accompanying drawing, and pointed out in the claimshereto appended, it being understood that various changes in the form,proportion, size, and minor details of construction, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing :Figure 1 is a side view of a cam constructed inaccordance with this invention and shown a plied to a cam shaft. Fig. 2is a plan view of the same. Fig. 3 is a sectional view on the line 8-3of Fig. 2. Fig. 4 is a sectional view taken substantially on the line 44of Fig. 1. Fig. 5 is a transverse sectional view on the line 5-5 ofFig. 1. Fig. 6 is a detail view of one of the removable Fig. 7 is adetail view of one of the arms of the cam illustrating the constructionof the longitudinal rib with which the removable shoe is interlocked.Fig. 8 is a detail view of the U-shaped spring for holding the removableshoe in engagement with the longitudinal rib of the cam. Fig. 9 is adetail view illustrating a modification of the invention. Fig. 10 is adetail perspective view of an eccentric wedge illustrating anothermodification of the invention.

Like numerals of reference designate corresponding parts in all thefigures of the drawing.

'1 designates a cam provided with oppositely disposed arms 2, enlargedat their peripheral portions 3 and provided with narrow or reduced bodyportions 4, which are strengthened or reinforced at opposite sides bylaterally projecting approximately parallel ribs 5, which are formedintegral with the body portion of the arm and which are spaced apart,as'clearly illustrated in Fig. 5 of the drawing. These ribs enable thecam to be made comparatively light without sacrificing any of thenecessary strength and they reduce the amount of metal and, therebylessen the cost of the cam. The arms 2 are of the usual form andoppositely curved, as clearly shown in Fig. 1 of the drawing, and theribs extend from the hub or central portion of the cam to the outer endsof the arms at the concave edges thereof.

Each arm is provided at its engaging concave face with a removable shoe6, forming a wear-plate and adapted to receive the wear incident to theengagement of the cam with a tappet and capable of being readily removedand renewed without discardingthe body portion of the cam. The shoe 6 iscurved to conform to the configuration of the adjacent face of the armof the cam, and the latter is provided at its convex face or edge with acurved longitudinal rib 7, formed integral with the cam and fittingwithin a groove 8 of the shoe, whereby the latter is detachablyinterlocked with the cam. The groove 8 is formed in the inner concaveface of the shoe and it is provided at intervals with opposite recesses9 adapted to receivetapering enlargements or lugs 10, located atopposite sides ofthe longitudinal rib. The recesses 9 are tapering andthe lugs 10 form tapering enlargements of the ribs. The side edges ofthe tapering recesses areundercut or inclined to form dovetailedportions, and the tapering enlargements of the rib have inclined sideedges which are interlocked with the side walls of the recesses bysliding the shoe outward on the arm of the cam. This movement firmlyinterlocks the removable shoe with the arm of the cam, and the pres,sure resulting from the engagement of the cam with a tappet willoperate to force the shoe tightly in engagement with the lugs or venlargements of the rib, whereby the shoe at each, revolution of thecam.

will be effectually prevented from becoming accidentally disengaged fromthe cam while the stamp mill is in operation. After the shoe has beenmoved outwardly suffi ciently to interlock it with the arm, a spring 12,is placedbetween the inner end of the shoe and the body of the cam,which is provided with a shoulder 13. The inner end 14 of the shoe isgrooved to receive the sides of the spring, which is approximatelyU-shaped and which is compressed when placed in position. The spring isadapted to be readily removed when it is desired to detach the shoe, andinstead of employing a spring, any other form of locking means maybe'provided for this purpose.

The shoe, as illustrated in Fig. 2 of the drawing, is provided in itsouter conveX face with a series of longitudinal grooves 15 adapted toreceive and hold a quantity of lubricating compound or composition,where by the parts will be automaticallylubricated This will obviate thenecessity of frequent lubrication of the cam by hand.

The cam is provided with an eye '16 for the reception of a cam-shaft 17,and the body of the cam is centrally enlarged to form a hub extension18. The eye receives a pair of reversely-arranged eccentric wedges 19and 20, which are curved, and which taper from one side edge to theother. These curved wedges, which have an. opening between them for thecam-shaft, present inner concave faces to the same and outer convexfaces to the walls of the eye 16, and they are preferably provided attheir ends with outwardly-extending curved flanges 21, forming groovesfor receiving the body of the cam,

whereby the wedges are retained in position in the eye of the cam, andare held against endwise movement. The wedge 19 is pro vided at itsinner concave cam shaft engaging face with alligator teeth 22,approximately similarto those of an alligator wrench and adapted toengage the cam shaft, whereby the wedge is prevented from slippingbackward when the cam is subjected to the pressure resulting from theengagement of the cam with a tappet. The wedge 19 is also provided atits outer convex face with alligator teeth for engaging the wall of theeye. The other wedge 20 is provided at its convex face with similarteeth 23 for engaging the wall of the eye of .the cam, whereby the wedge20 is prevented from slipping. The concave face of the wedge 20 isprovided with alligator teeth for engaging the shaft. The eccentricwedges are separated at each side edge by an interspace and are thusadapted to grip tightly the cam shaft, and they are capable ofeffectually preventing the cam from slipping, and the greater thepressure to which the cam is subjected the greater will be the grippingaction of the eccentric wedges. Instead of providing teeth, the surfacesof the eccentric wedges may be corrugated or otherwise roughened toenable them to engage the cam shaftand the Walls of the eye of the cam.Also, as illustrated in Fig. 9 of the drawing, a dowel-pin 24 may beemployed, the wedge 25 and the wall of the eye being provided withopposite grooves, as shown. This will enable the outer face of the wedge25 to be made smooth, as the dowel-pin or key will prevent the wedgefrom slipping. The inner face of the wedge 25 may be made smooth, asshown in Fig. 9, and the opposite wedge 26, may have a smooth outerface, as shown in this figure of the drawing, teeth 27 being provided atthe inner concave face of the wedge 26 for engaging the cam shaft. Witha cam having Wedges constructed substantially, as shown in Fig. 9, aslight blow of a hammer on one end of the cam, forcing it backward, willloosen the same, and the cam may then be readily removed when the camshaft is re moved from its bearings.

WVheri it is desired to provide means for positively locking the camagainst movement in either direction, the outer face of the wedge 19 mayas illustrated in Fig. 1 be provided with teeth 28 and the inner face ofthe wedge 20 may be provided with teeth 29. The teeth at the inner faceof the wedge 19 are adapted to engage the cam shaftto pre vent the camfrom slipping backward. when engaging a tappet, and the teeth at theouter face of the wedge 19 are arranged to engage the wall of the eye ofthe cam and will prevent the latter from moving in an opposite directionon the wedge. The teeth of the other wedge 20' are arranged the reverseof those of the wedge 19, the outer face of the wedge 20 being arrangedto engage the cam when the latter is subjected to pressure incident tothe engagement of the cam with a tappet, and the teeth at the inner faceof the wedge being adapted to resist movement in the opposite direction.These wedges are alligator applicable to pulleys and other rotary de" Ivices where it is desirable to look a member rigidly with a shaft, andif desired, a plurality of wedges, consisting of a combination of thosein Figs. 1 and 9, may be employed. Also, as illustrated in Fig. 10, awedge may be used having circular ribs or teeth '30 to engage the camshaft and prevent the cam from moving laterally on the cam shaft.

In assembling the parts, the wedges are placed within the eye of the cambefore the cam shaft is introduced into the opening or space between thewedges, and one of the flanges 21 of each wedge will be reduced attheterminals, as illustrated in Figs. 4. and 10, to enable the wedge to beintroduced into the eye of the cam.

7 It will be seen that the cam is exceedingly simple, and inexpensive inconstruction, that it is light, strong and durable, and that theremovable shoes, which receive the wear and which may be renewed whenworn, are detachably interlocked with the body portion of the cam andare adapted to be readily applied thereto and removed therefrom. Also,it will be apparent that the removable shoes render the body portion ofthe cam practically indestructible, and that the grooves of the shoe areadapted to hold a quantity of lubricating compound or material toobviate the necessity of frequent lubrication by hand and to preventwear and, thereby increase the length of life of the shoes. Furthermore,it will be clear that the eccentrically arranged wedges are adapted tosecurely lock the cam to a cam shaft, that the greater the pressure towhich the cam is subjected the greater will be the gripping action ofthe wedges, and that they will permit a cam to be readily removed whendesired.

Having thus fully described my invention, what I claim as new, anddesire to secure by' Letters Patent, is 2- 1.. In a device of the classdescribed, the combination of a body provided with an eye,andreversely-disposed eccentrically-arranged curved wedges tapered fromone side edge to the other and fitting within the eye and having anopening between them for a shaft, said wedges being provided with meansfor positively engaging the shaft and the body, and also with means forholding the wedges against endwise movement.

2. In a device of the class described, the combination of a bodyprovided with an eye, and reversely disposed eccentrically arrangedcurved wedges tapered from oneside edge to the other and spaced apart attheir side edges and fitting within the eye and having an openingbetween them for a l shaft, one of the wedges being provided at itsinner face with means for positively engaging the shaft, and the otherwedge being provided at its outer face with means for engaging the body.

3. In a device of the class described, the combination of a bodyprovided with an eye, reversely disposed eccentrically arranged curvedwedges tapered from one side edge to the other and spaced apart at theirside edges and fitting within the eye and having an opening between themfor a shaft, one of the wedges being provided at its inner face withteeth for engaging the shaft, and a dowel pin arranged at the outer faceof the other wedge and engaging the body. a

4. In a device of the class described, the combination of a body havingan eye, and reversely disposed eccentrically arranged curved wedges,spaced apart and ta ered from one side edge to the other and fittingwithin the eye and having an opening between them to receive a shaft,said wedges being provided at their ends with exterior flanges locatedat both of the side faces of the body and engaging the same, whereby theWedges are held against movement laterally of the body.

5. In a device of the class described, the combination of a bodyprovided with an eye adapted to receive a shaft, and reverselydisposedeccentrically arranged curved wedges tapered from one side edge to theother and located within the eye and having an opening between them forthe shaft and engaging the same and the walls of theeye, said wedgesbeing extended entirely through the eye and provided at both ends withoutwardly projecting flanges which engage the body, whereby the wedgesare held against movement laterally of the said body.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

JAMES CHARLES HOSKINS VAUGHT.

Witnesses:

FRANK J. Wrcennr, EDWARD F. PAOA.

